Fireproof door.



v FIREPROOE DOOR. APPLICATION FILED JAN.29. 1914.

Patent-ed Dec. 14, 1915.

n me games Parana c arion FRED W. HARGRAVE, OF SOUTH RIVER, AND JAMES A:

WHEELER, or SOMERSET COUNTY, NEW JERSEY, ASSIGNORS T0 WILLIAM T.ELKTNTON, 0F PHILADEIb PHIA,PENNSYLVA1\TIA.

'rrzanrnoor noon.

To all whom it may concern:

Be it known that We', FnnD W.IH.-XRGRAVE, a resident ofSouth River, inthe county of Middlesex and State of New Jersey, and JAMES Al WHEELER, aresident of the county of Somerset/in the State of New Jersey, bothcitizens-of the United States, have invented certain new and usefulImprovements in Fireproof Doors, of which the fol lowing isa'specification.

This invention relates to fireproof doors ofthat class which areconstructed of an artificial fireproof lumber or composition and'm'etalli-c elements, and it has for-its object to provide a sim'pleandimproved fireproof doorof this character which will possess adthecomposition which vantages in point of-lightness and strength,resistance to strains, effectiveness and general efficiency, and whichwill furthermore be simple and inexpensive in construction and can bemanufactured with facility and economy. I

In the drawings Figure 1 is a face view of the door embodying ourimprovements, partly broken away to show the interior construction.-Fig. 2 is a detail vertical crosssection, on an enlargedSc'ale, takenon the line w-w, Fig. 1; Fig. 3 is a detail hori- 'zontal-cross-section,on an enlarged scale,

taken on the line .Z/-Q/, Fig. 1. r Corresponding partsinall the figuresare Our invention'comprises in its main characteristics an exteriormetallic casing or sheathing which incloses an internal body structureformed of an artificial fireproof lumber or composition. The elements ofthe main body portion constituted by said internal structure. within-theouter sheathing are formed of'a rigid non-metallic composition of lowheat conductivity and undeformable by heat, and the artificial fireprooflumber or composition may be of any suitable material, but we prefer touse for this purpose is commerciallyknown as alignum and which isconstituted by a suitable .fillerincluding asbestos and combined with afireproof binder to produce a plastic substance which is molded infoShape nd compressed and dried in a rigid structure.-- 1 Ispecificationof Letters Patent. Paibgmpedl Dqgqg, 1141, 15915Application filed January 29, 1914. Serial No. 815,141. i

Referring to the drawings, l designates the exterior casing orsheathing, which forms the surface of the door and extends over the areaof the same at the sides and edges thereof. This metallic casing'orsurfacing is, in practical manufacture, consti tuted by twocorresponding halfparts or sections, 2%2, each of which halves comprisesathin metallic plate or sheet, 3, bent into proper angular contour incross-section and forming the face of the door and half of the edgeportion thereof. The metallic casing or sheathing plates 3 thusrespectively fOIl'flChfiIlIlGlS or molds within which are held thenon-metallic andfireproof composition elements which constitute theinternal' body structure of the door.

The improved construction and arrange ment, as comprised in our presentinvention and improvements, enables the molding, in practical andeconomical manufacture, of the internal body composition structurewithin the mold formed by the metallic sheathing 'plates 3 of thehalf-sections ofthe exterior casing 1. Thus, in manufacture, thehalf-section molds or channels constituted by the metallic sheathingplates 3 are placed and braced in a suitable press, and the compositionforming, the-internal body structure is molded therein in a plasticstate, with the employment of suitable cores to' produce the desiredmolded'contour, and

is compressed and dried in a rigid structure.

To facilitate theretention of the internal composition,- during the andafter it is compressed and dried in positiornthe edges'of the plate 3which are positioned at the edge portion of the door, as at 4, areturned inwardly at an angle to form a projecting retaining flange, as at5.

The internal body composition has, in its preferred molded "form, arelatively-thin base portion, 6, extending againstand over the area ofthe face portion of the sheathing plate 3 whichforms the side surface ofthe door, and thickened edge portions, as at 7, forming continuousblocks or bars extending around the edge portion of the sheathing plate3 which extends at the-edge molding operation.

edge block or bar portions of the door and extend substantiallythroughout the entire interior body area thereof, for purposes oflightness and economy.

- The two half-sections 22 of the casing structure 1 have theirinnersurfaces, which are constituted by the faces of the thickened- 7 ofthe internal composition body Structure, abutted and se- "curedtogether, adhesively'or otherwise, as

at S), to produce the complete door structure, after the respectivehalf-sections 2-2 have been constructed or produced as above described.

In the internal open area or space 8, brac-' ing means are preferablyprovided between the side portions of the door. structure, and thepreferred construction for this purpose comprises bars or blocks, as at10, extending continuously between the top and bottom of the door and inparallel position at suitable intervals. These bracing bars or blocksare thus, in the half-sectional construction as herein shown,constituted by two half-sections 11-.-11, respectively carried by thehalf-sections 22 of" the casing structure and having their inner facesabutted and secured together, adliesively or otherwise, as

In the practicalmanufacture, in which the internal composition bodystructure (3--7 is molded'within the sheathing plate3 of thehalf-sections 2 of the exterior casing 1, the half-sections 11 of thecontinuous bracing blocks or'bars 10, are likewise molded in positionwithin the half-sectionsQ of,

r the casing structure, in a plastic state, with the employment ofsuitable cores to produce the desired molded contour, and are compressedand dried in a rigid structure. The half-sections of the continuousinternal bracing bars or blocks thus have their base upon the'relatively tliin base portion 6 of.

the internal composition body structure and project therefrom and extendbetween the thickened edge portions 7 thereof at the top and bottom ofthe door, and divide the in ternal open hollow area 8 into a pluralityofopen spaces. Said internal bracing bars "or blocks are likewiseofthenon-metallic fireproof composition corresponding to the compositionof the internal body structure,

and under some conditions of manufacture they may be molded or formedseparately from the internal composition body structure and secured inconnection therewith and in proper positionadhesively or in any othersuitable manner. Our improved door structure is also preferably providedinternally with blocks, as at 14:, likewise formed of j the non-metallicfireproof composition as hereinreferred to, and located Within theinternal area orspace' 8 at suitable points, which blocks means for theu tt in the attachment of the rovide strong and effective hinges, locks,or other supplementary devices of the door. Said blocks .14 areadliesively or otherwise secured in position against the thickenededge-portions 7 and betweenthe base portions 6' of the internalcomposition body structure.

It will be understood that all the various parts of the. door structure,as hereinbefore described, may be secured in connection adhesivelyor bythe employment of screws or bolts at any desired point, as the rigidnonmetallic fireproof composition herein. constituting the main bodystructure can be worked or will receive nails or screws in the samemanner as ordinary lumber. .The outer faees of the casing-1 are suitablyfinished, in imitation of grained wood or as otherwise desired, and maybe orna -1nented to impart "any desired effector-characteristics to thedoor surface. For instance,ornamental molding strips may be'securedupon. said faces, to produce panel Y effects or other ornamentalirregularities of the surface. It will be. also understood that the doorstructure maybe made up of a plui-ality of sections constructed-andembody ing the general features as hereinbefore demain structure isconstituted by-the rigid non-metallic composition of low heatconductivity and undeformable by heat, and is therefore resistant to theaction ofextreme heat to maintain the normal conditions'of the doorstructure and preclude the breaking down of the same under the action ofheat. In this connection, theofiice of the thin "metallic surfacing orsheathing which forms the exterior sur facefofthe door is to precludeimpairment of the finished surface by dents'or other COIIdItLOIIS ofusage or Wear,

and also to serve as a niold in which the non-- metallic fireproofcomposition constituting the internal body structure can be molded. inplastic conditioninto its structural shape and compressed and dried inarigidstruo ture, thus facilitating lightness and economy in manufacture.Under the action of eX- ti'eme heat, the exterior metallic casing orsheathing is effectively protected against deformation inasmuch as it issustained-at all points by the inclosed composition body structure whichconforms to the same and which is non-metallic and of low heatconductivity and undeform'able by heat.

The improved construction,- as comprised in our invention, provides avery simp'le and light door structure which is thoroughly braced againstany strains or conditions of use, which can'be easily and'economicallymanufactured, and whichwill possess in characteristics and strength.

We do not desire to be understood as Y limiting ourselves to the detailconstruction and arrangement of parts as hereinshown and described, asit is manifest that variations and modifications therein may be resorted to, in the adaptation of our invention to varying conditionsofuse, without departingfrom the spirit and scope of our inven-- tion andimprovements, Ye therefore remodifications as properly fall vithin thescope of our invention and the terms of the following claims. r

Having thus described ourinvention, we claim and desire to secure byLetters Patent:

1. An improved fireproof door, comprising an exterior casing orsheathing constituted by corresponding half-sections each consisting ofa metallic plate forming the surface of the doorand extending over theside and edge portion thereof and an internal body structure inclosedWithin saldsections of the metallic casing and formed of a rigidnon-metallic composition of low heat conductivity and undeformable byheat, said half-sections being secured together with their inner facesabutting and said internal composition body structure being in its mainarea of less thickness than the halfsection of the door and forminganinterior ,open area or space between the portions of the metallicsheathing which extend over the sides of the door. 1

2. An improved fireproof door, comprising an exterior casing orsheathing constituted by corresponding half-sections each consisting ofa metallic plate forming the surface of the door at the-side and edgeportion thereof and an internal body structurev inclosed Within saidsections of the metallic casing and formed of a rigid non-metalliccomposition of low heat conductivity and undeformable by heat, saidinternal composition body-portion of the half sections of the exteriormetallic casing having a base portion extending against the side face ofthe sheathing plate and thickened edge portions forming continuousblocks or bars ex tending around the 4 edge portion of the sheathingplate, and the half-sections of said casing being'secured'together Withthe faces of said thickened edge portions abutting, whereby an interioropen area or space is formed.

3., An improvedfireproof door, comprising an exterior casing orsheathing constituted by correspondinghalf-sections each consisting of ametallic plate forming the surface of the door at theiside and edge por'tion thereof and an internal body structure inclosed Within saidsections of the metallic casing and formed of a rigid non-metalliccomposition of low heat conductivity and undeformable heat, saidinternal composition body having an interior open area or space and saidhalf-sections being secured together with their inner faces abutting,and

.tivity and undeformable by heat. serve the right to all such variationsand 4. An improved-fireproof door, compristuted by correspondinghalf-sections eachconsisting of a metallic plate forming the surface ofthe door at the side and edge portion thereof and an internal bodystructure inclosed within said sections of the metallic casing andformed of a rigid nonmetallic composition of low heat conductivity andundeformable by heat, said internal composition body portion of thehalfsections of the exterior metallic casing hav-- ing a base portionextending against the side face of the sheathing plate and thickenededge portions forming continuous blocks or bars extending around theedge portion of the sheathing plate, and the half-sections of saidcasing being secured together with the faces of said thickened edgeportions abutting, whereby an interior open area or spaceis formed, andbracing bars or blocks extending within said interior open area or spaceof the. half-sections of the casing and between the thickened edgeportions of said internal composition body and having their inner facesabutted, said bars or blocks being formed of a rigid non-metalliccomposition of low-heat conductivity and undeformable by heat. I

5. An improved fireproof door, compris ing an exterior casing orsheathing forming the surface of the door at the side and edge portionthereof, said casing being constituted by corresponding half-sectionseach consisting of a metallic plate forming a mold Within Which anonemetallic composition of low heat conductivity is molded into shapeand compressed and dried in a' rigid structure undeformable by heat,said composition forming an internal body structure inclosed within thehalf-sections of said metallic casing and being in its main area of lessthickness than thehalf-sections of the door and said half-sections beingsecured together With their inner faces abutting.

6. An improved fireproof door, compris- I ing tvvo correspondinghalf-sections each having an internal body structure formed of a rigidnonmetallic compositionof 10W heat conductivlty and undeformable by heatand an exterior metallic casing Which carries and incloses said bodycomposition and forms the external sheathing or surface of thestructure, said external sheathing being ,eo11stituted by a casing moldwithin which names inthe presence of the subscribing Witsa 1d lnternalcomposition body mass is comnesses.

pressed and molded 'into shape and dried in FRED W; HARGRAVE. a rigidstructure, the corresponding half- JAMES A. WHEELER. 5 sections beingsecured together with their Witnesses:

inner surfaces abutting; J 0s. REED LITTELL,

In testimony whereof We have signed our GEORGE N. SAGE.

